A prototype Rollkers transportation device is displayed during a press event at the Mandalay Bay Convention Center for the 2015 International CES on January 4, 2015 in Las Vegas, Nevada. The product is not a skate; it balances for you and when you place it on the bottom of your shoe, it gives you the ability for faster transportation based on walking. The balance CES, the world's largest annual consumer technology trade show, runs from January 6-9 and is expected to feature 3,600 exhibitors showing off their latest products and services to about 150,000 attendees. (Photo by Ethan Miller/Getty Images)

The Rollkers, a transportation accessory that increases a person's average walking rate up to 7 miles per hour, is seen on January 4, 2014 before the start of the 2015 Consumer Electronics Show in Las Vegas, Nevada. 2015 International CES, the world's largest showcase for the latest in consumer electronics, runs on January 6-9, with media preview days on January 4 and 5. (Photo by Robyn Beck/AFP Photo)

The Rollkers, a transportation accessory that increases a person's average walking rate up to 7 miles per hour, is seen in use on January 4, 2014 before the start of the 2015 Consumer Electronics Show in Las Vegas, Nevada. (Photo by Robyn Beck/AFP Photo)

Thierry Reymond walks on Rollkers, a transportation accessory that increases a person's average walking rate up to 7 miles per hour, January 4, 2014 before the start of the 2015 Consumer Electronics Show in Las Vegas, Nevada. (Photo by Robyn Beck/AFP Photo)

CEO of French company Rollkers holds up the World's First Electronic 'Under Shoe' which allows pedestrians to be automatically propelled along the street at the Unveiled press preview event for the 2015 International Consumer Electronics Show (CES) at the Mandalay Bay Convention Center in Las Vegas, Nevada, USA, 04 January 2015. CES, the world's largest annual consumer technology trade show runs from 06 to 09 January 2015 and is expected to feature 3,500 exhibitors presenting their latest products and services to about 150,000 attendees. (Photo by Michael Nelson/EPA)